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Abstract According to the characteristics of old in-use tunnels of Shenyang—Dandong railway，an investigation on defects like water leaking has been carried out by sketch of tunnel damage and ground penetrating radar(GPR) scanning. The features of defects such as tunnel lining cracking，surface corrosion，water infiltration，freeze-thaw，lining vacuousness，collapse and rockfall of the entrance，etc. are studied and analyzed carefully. The degradation mechanism of tunnels is briefly analyzed from the physical factors and chemical factors. Based on the above， combining the relevant data and operating characteristics of the railway tunnel in cold regions，the flow chart of tunnel maintenance and the main repair methods are given. And these methods are carried out in the Fenshuiling tunnel maintenance works at last. The paper provides theoretical basis for integrated maintenance of tunnels and contributes to the guidance for engineering practice.
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Received: 24 February 2011
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2011, Vol. 30 
